I'd go with your latest date 'officially' Anna, cos then, as the others have said, you'll have more room to go over. In your head though, be prepared to go early (especially having your 3 so close together).
From my observations, some people are long bakers and some are short bakers too. Some people consistenly go over, have their babies at 41 weeks, and others have never made full term. So I'd go with your track record a bit as well - for example, Riv was 5 or so days early, Si was 2 days, so I'd be prepared for a third baby to come earlier as well.
Being that they're all within days of eachother I'd be going with the latest date. There is only 5 days between your earliest and latest date which isn't a huge discrepancy. The EDD is only an estimated due date - so whether the 3rd or the 8th, there still pretty much around the same time.
That will mean at the end of pregnancy you're less likely to be deemed to be "postdates" and have to deal with all it's associated dramas (because babies come when they're ready right? )
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